Technique for selective fat saturation in MR imaging

Details Technique for selective fat saturation in MR imaging Technique for selective fat saturation in MR imaging

1995-06-30

1996-04-23

Tokar, Michael

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

055107133

ABSTRACT:
A system is provided for MR imaging wherein a volume within an imaging subject positioned with respect to the system contains both water molecules and fat tissue proximate to one another. The water molecules and fat tissue are selectively saturated by first determining whether application of a first RF excitation pulse of a first RF frequency to the volume, in association with a gradient magnetic field having a selected polarity with respect to an axis, would saturate fat tissue in a band lying closer to or farther from a selected location than a band of saturated water molecules. The first frequency comprises the sum of a center frequency and a first offset frequency having a magnitude and polarity determined by the gradient magnetic field. In the event the saturated fat band associated with the first frequency would lie farther from the specified location, a second RF pulse of a second RF frequency is instead applied to the volume to saturate fat tissue within a band lying closer to the specified location, the second RF frequency comprising the sum of the center frequency and a second offset frequency having a magnitude equal to the magnitude of the first offset frequency and a polarity opposite to the polarity thereof. The polarity of the selection gradient of the second RF pulse is similarly negated compared to the polarity of the selection gradient of the first pulse.

REFERENCES:
patent: 4581582 (1986-04-01), Redington
patent: 4618827 (1986-10-01), Redington et al.
patent: 4680546 (1987-07-01), Dumoulin
patent: 4843322 (1989-06-01), Glover
patent: 4885542 (1989-12-01), Yao et al.
patent: 5055789 (1991-10-01), Kondo et al.
patent: 5134372 (1992-07-01), Inoue
patent: 5225781 (1993-07-01), Glover et al.
patent: 5250899 (1993-10-01), Listerud et al.
Doyle et al, "A New Acquisition Mode for 2D Inflow Refreshment Angiography", Magnetic Resonance in Medicine 18, 51-62 (Mar. 1991).
M. A. Bernstein, "Flow Phenomena in MRI", Current Concepts of Magnetic Resonance (Oct. 1994).
Volk et al, "Chemical Shift-Specific Slice Selection. A New Method for Chemical Shift Imaging at High Magnetic Field", Journal of Magnetic Resonance 71, 168-174 (1987).
D. G. Nishimura, "Contrast Manipulation", Current Concepts of Magnetic Resonance, 45-49 (Oct. 1994).
D. G. Nishimura, "Time-of-Flight Angiography-Physics", Current Concepts of Magnetic Resonance, 91-96 (Oct. 1994).
Pauly et al, "Slice-Selective Excitation for Very Short T.sub.2 Species", Book of Abstracts vol. 1, p. 28, SMRM (Aug. 1989).
Purdy et al, "Overlapping Traveling Saturation Bands for Background Suppression in 2-D Time-of-Flight Angiography", Proceedings of SMR vol. 2, p. 954 (Aug. 1994).
T. Dixon, "Simple Proton Spectroscopic Imaging", Radiology 153:189-194 (Oct. 1984).
Keller et al, "MR Angiography with Two-dimensional Acquisition and Three-dimensional Display", Radiology 173:527-532 (Nov. 1989).
Gomori et al, "Fat Suppression by Section-Select Gradient Reversal on Spin-Echo MR Imaging", Radiology 168:493-495 (1988).

Affiliated with

Also associated with

Rating

Technique for selective fat saturation in MR imaging does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Technique for selective fat saturation in MR imaging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Technique for selective fat saturation in MR imaging will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2311562